為什麼Windows 11桌面背景模糊？

Windows 11桌面背景模糊通常由三個原因導致，需分別解決。 1. 圖像分辨率與屏幕尺寸不匹配時，系統會拉伸圖片導致模糊，應使用畫圖工具或在線調整器將壁紙調整為屏幕原生分辨率（可在設置>系統>顯示中查看）。 2. 使用低質量格式如高壓縮JPEG或社交媒體縮略圖會導致失真，建議改用PNG格式或從Unsplash等網站獲取高清壁紙，避免使用手機截圖。 3. 顯示縮放設置可能影響清晰度，可前往設置>系統>顯示>縮放與佈局嘗試不同選項，並在個性化>背景中切換“填充”“拉伸”等適配模式，必要時臨時更換壁紙以刷新顯示。

If you're seeing a blurry desktop background on Windows 11, it's usually not a random glitch — there are some common reasons behind it. Fixing the issue often comes down to understanding what settings or file types are involved.

1. Image Resolution Doesn't Match Screen Size

One of the most common causes is using an image that doesn't match your monitor's resolution. If your screen is set to 1920x1080 and your wallpaper is only 800x600, Windows will stretch it to fit, making it look blurry.

• Resize the image to match your screen resolution using tools like Paint or online resizers.
• You can check your display resolution in Settings > System > Display.

Windows also sometimes picks a lower-resolution thumbnail instead of the full image when applying backgrounds, especially if the file is large or complex.

2. Using a Low-Quality Image Format or Compression

Some image formats or compression methods don't hold up well as desktop backgrounds. For example:

• JPEG files with heavy compression might show artifacts or appear soft.
• Thumbnails from web pages or social media are often downscaled automatically.

Try using PNG for sharper results, or find a high-resolution version of your desired wallpaper from sites like Unsplash or WallpaperHub.

Also, avoid using screenshots taken from mobile devices — they're often optimized for small screens and won't scale well to desktop displays.

3. Display Settings and Scaling Interfere With Background Clarity

Windows 11 uses scaling to make text and apps more readable on high-DPI displays. While helpful, this can sometimes affect how the desktop background appears.

• Go to Settings > System > Display > Scale and Layout.
• Try switching between scaling options (like 100%, 125%) and see if it affects the background clarity.

Also, under Personalization > Background, switch the "Choose a fit" option — "Fill" or "Stretch" may look better than "Fit" depending on your image and screen ratio.

Sometimes just toggling these settings or changing wallpapers temporarily then going back can force Windows to refresh the background properly.

That's about it — blurry desktop backgrounds on Windows 11 are usually due to mismatched resolutions, low-quality images, or scaling quirks. Nothing too serious, but it can be annoying if you're going for that clean, sharp look.

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